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khaibl đăng này 26 Tháng Mười 2017
SELECT COALESCE((Select Top 1 dien_giai From ct70 where 1=0),NULL) as dien_giai2, ...
Thông qua hàm COALESCE
https://stackoverflow.com/questions/5465245/create-a-nullable-column-using-sql-server-select-into
Posted : 15/05/2020 2:48 am